A Search for QPOs in the Blazar OJ287: Preliminary Results from the 2015/2016 Observing Campaign
M D P I AG
Pysyvä osoite
Verkkojulkaisu
Tiivistelmä
We analyse the light curve in the R band of the blazar OJ287,
gathered during the 2015/2016 observing season. We did a search for
quasi-periodic oscillations (QPOs) using several methods over a wide
range of timescales. No statistically significant periods were found in
the high-frequency domain both in the ground-based data and in Kepler
observations. In the longer-period domain, the Lomb–Scargle periodogram
revealed several peaks above the 99% significance level. The longest
one—about 95 days—corresponds to the innermost stable circular orbit
(ISCO) period of the more massive black hole. The 43-day period could be
an alias, or it can be attributed to accretion in the form of a
two-armed spiral wave.